package com.project.plus.controller;/**
 * Created by Administrator on 2020/9/27.
 */

import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.Producer;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.image.BufferedImage;

/**
 * @ClassName CodeController
 * @Description TODO
 * @Author Invoker
 * @Date 2020/9/27 15:02
 * @Version 1.0
 */
@Controller
public class CodeController {
    
    @Autowired
    private Producer kaptchaProducer = null;
    
    @RequestMapping("/kaptcha")
    public void getKaptchaImage(HttpServletRequest request, HttpServletResponse response) throws Exception{

        HttpSession session = request.getSession();
        response.setDateHeader("Expires", 0);
        response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
        response.addHeader("Cache-Control", "post-check=0, pre-check=0");
        response.setHeader("Pragma", "no-cache");
        response.setContentType("image/jpeg");
        //生成验证码
        String kapText = kaptchaProducer.createText();
        //向客户端写出图片
        BufferedImage bi = kaptchaProducer.createImage(kapText);
        session.setAttribute(Constants.KAPTCHA_SESSION_KEY,kapText);
        
        ServletOutputStream out = response.getOutputStream();
        ImageIO.write(bi,"jpg",out);
        try {
            out.flush();
        }catch (Exception e) {
            e.printStackTrace();
        }finally {
            out.close();
        }
    }
}
